Convert plugin using modification time instead of just existence

[K9-guardian]

I've made this change in my convert plugin.

diff --git a/beetsplug/convert.py b/beetsplug/convert.py
index 0c50fc73f..285394ff1 100644
--- a/beetsplug/convert.py
+++ b/beetsplug/convert.py
@@ -382,9 +382,10 @@ class ConvertPlugin(BeetsPlugin):
                 with _fs_lock:
                     util.mkdirall(dest)
 
-            if os.path.exists(util.syspath(dest)):
+            if os.path.exists(util.syspath(dest)) and item.current_mtime() <= os.path.getmtime(dest):
                 self._log.info(
-                    "Skipping {0} (target file exists)",
+                    "Skipping {0} (target file newer than original)",
                     util.displayable_path(item.path),
                 )
                 continue

It checks the modification time of the original file to see if it's updated since conversion. This was really useful when I was trying to change stuff like genre tags or adding replayGain, as without this change, the convert plugin would skip over the files that already existed, even though I want them to be re-converted to get the updated metadata.

I think this could be much better though, as for just metadata changes you can perform a more efficient ffmpeg command, but I'm not entirely sure a good way to implement that. Maybe this could just be an optional flag?

[wisp3rwind]

The plugin at https://github.com/geigerzaehler/beets-alternatives might be better suited to what you want to achieve.

[K9-guardian]

Thank you for the help! I think this plugin does exactly what I'm looking for yes.